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The Facts of Population Growth
How Many People Have Ever Lived on Earth?
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abortion achieved activities Africa agricultural already applied areas Asia become better birth control birth rates capital China cities concerned considerable continue contraceptive countries cultural death rates decline demographic East economic effective efforts environment estimated Europe existence fact family planning fertility field Ford Foundation future genetic given governments greater groups growing housing human important improvement income increase India individual industrial land Latin America least less limited living major material means methods million natural organizations period persons political population growth population problem possible practical present production programs progress projections public health reason recent region relation result social society sterilization studies supplies tion United Nations University urban values women world population York